Defrosting control method and device for heat exchanger of outdoor unit

Abstract

The invention relates to the technical field of air conditioners, and discloses a defrosting control method and device for an outdoor unit heat exchanger, and the method comprises the steps that environment parameters of the outdoor unit heat exchanger of an air conditioning system and a first temperature parameter of a defrosting coil pipe of the air conditioning system are obtained; according to the environment parameters and the temperature parameters, whether the current condition of the air conditioning system meets a preset defrosting entering condition or not is judged; when it is judged that the current condition of the air conditioner system meets the defrosting entering condition, operation control parameters of a defrosting assembly of the air conditioner system are determined, and the defrosting assembly comprises one or more combinations of a four-way valve, an electronic expansion valve and a fan; and according to the operation control parameters of the defrosting assembly, the air conditioning system is controlled to execute defrosting operation on the outdoor unit heat exchanger. It can be seen that the defrosting control accuracy of the outdoor unit can be improved, the defrosting efficiency of the outdoor unit can be improved, the good defrosting effect can be achieved, and therefore normal operation of the air conditioner system is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a defrosting control method and device for an outdoor unit heat exchanger. Background Art

[0002] In the prior art, air conditioning systems usually perform defrost control through temperature sensors installed in the outdoor unit. For example, when the surface temperature of the outdoor unit is detected to be lower than or equal to the freezing temperature, it will automatically switch to defrost mode and melt the ice and snow on the surface of the outdoor unit by heating to achieve defrost control.

[0003] However, the current defrost control method is based on the freezing temperature control method, which is relatively simple, and the surface temperature of the outdoor unit is easily affected by other factors (such as air humidity, wind speed, surface material of the outdoor unit, etc.), which easily leads to low accuracy of defrost control of the outdoor unit and is not conducive to defrost efficiency. It can be seen that it is particularly important to propose a technical solution to improve the defrost control accuracy and defrost efficiency of the outdoor unit. Summary of the invention

[0004] The present invention provides a defrost control method and device for an outdoor unit heat exchanger, which can improve the defrost control accuracy and defrost efficiency of the outdoor unit.

[0005] In order to solve the above technical problems, the first aspect of the present invention discloses a defrosting control method for an outdoor heat exchanger, the method comprising:

[0006] Acquire an environmental parameter of an outdoor unit heat exchanger of an air conditioning system and a first temperature parameter of a defrost coil of the air conditioning system;

[0007] Determining whether a current condition of the air-conditioning system meets a preset defrost entry condition according to the environmental parameter and the first temperature parameter;

[0008] When it is determined that the current condition of the air-conditioning system meets the defrost entry condition, determining the operation control parameters of the defrost component of the air-conditioning system, the defrost component including one or more combinations of a four-way valve, an electronic expansion valve and a fan;

[0009] According to the operation control parameters of the defrost component, the air conditioning system is controlled to perform a defrost operation on the outdoor unit heat exchanger.

[0010] As an optional implementation, in the first aspect of the present invention, judging whether the current condition of the air-conditioning system meets the preset defrost entry condition according to the environmental parameter and the first temperature parameter includes:

[0011] Determining whether the ambient temperature in the ambient parameters is lower than or equal to a first preset temperature, which is recorded as a first condition;

[0012] According to the acquired operation time parameter of the air conditioning system, determining whether the operation time parameter meets a preset operation time condition, and obtaining an operation time determination result, which is recorded as a second condition;

[0013] According to the ambient temperature, the surface temperature of the outdoor unit heat exchanger included in the ambient parameter, and the coil middle temperature of the defrost coil included in the first temperature parameter, determining whether each of the ambient temperature, the surface temperature, and the coil middle temperature satisfies a corresponding temperature condition, which is recorded as a third condition;

[0014] Among them, when the first condition, the second condition and the third condition are all met, it is determined that the current condition of the air-conditioning system meets the preset defrost entry condition; when at least one of the first condition, the second condition and the third condition is not met, it is determined that the current condition of the air-conditioning system does not meet the preset defrost entry condition.

[0015] As an optional embodiment, in the first aspect of the present invention, judging whether each of the ambient temperature, the surface temperature and the coil middle temperature satisfies the corresponding temperature condition according to the ambient temperature, the surface temperature of the outdoor unit heat exchanger included in the ambient parameter and the coil middle temperature of the defrost coil included in the first temperature parameter includes:

[0016] According to the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the coil middle temperature of the defrost coil included in the first temperature parameter, determining the target component temperature from the surface temperature and the coil middle temperature;

[0017] Determine whether the ambient temperature is within a first preset temperature range, and whether the target component temperature is lower than or equal to a second preset temperature within a first preset duration, which is recorded as a first temperature determination condition; or,

[0018] Determine whether the ambient temperature is within a second preset temperature range, and whether the target component temperature is lower than or equal to a third preset temperature within the first preset duration, which is recorded as a second temperature determination condition; or

[0019] Determine whether the ambient temperature is within a third preset temperature range, and whether the target component temperature is lower than or equal to a fourth preset temperature within the first preset duration, which is recorded as a third temperature determination condition; or,

[0020] Determining whether the ambient temperature is within a fourth preset temperature range, and whether the temperature of the target component is lower than or equal to a fifth preset temperature within the first preset duration, which is recorded as a fourth temperature determination condition;

[0021] Among them, when one of the first temperature judgment condition, the second temperature judgment condition, the third temperature judgment condition and the fourth temperature judgment condition is met, it is determined that each of the ambient temperature, the surface temperature and the middle temperature of the coil meets the corresponding temperature condition.

[0022] As an optional embodiment, in the first aspect of the present invention, the target component temperature is determined from the surface temperature and the middle temperature of the coil according to the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the middle temperature of the coil of the defrost coil included in the first temperature parameter, including:

[0023] According to the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the middle temperature of the coil of the defrost coil included in the first temperature parameter, the surface temperature and the middle temperature of the coil are compared to obtain a temperature comparison result;

[0024] When the temperature comparison result indicates that the middle temperature of the coil is lower than the surface temperature within a second preset duration, determining the middle temperature of the coil as the target component temperature;

[0025] When the temperature comparison result indicates that the surface temperature is lower than or equal to the middle temperature of the coil within the second preset duration, the surface temperature is determined as the target component temperature.

[0026] As an optional implementation, in the first aspect of the present invention, the operating time parameter includes the cumulative operating time of the last defrost;

[0027] And, judging whether the operating time parameter satisfies a preset operating time condition according to the acquired operating time parameter of the air-conditioning system, and obtaining an operating time judgment result includes:

[0028] According to the acquired accumulated operation time of the last defrost of the air-conditioning system, determining whether the accumulated operation time of the last defrost reaches a first preset operation time;

[0029] If it is determined that the last defrost cumulative operation time has not reached the first preset operation time, determining that the last defrost cumulative operation time does not meet the operation time condition corresponding to the last defrost cumulative operation time;

[0030] If it is determined that the last defrost cumulative running time reaches the first preset running time, it is determined that the last defrost cumulative running time satisfies the running time condition corresponding to the last defrost cumulative running time; or

[0031] If it is determined that the cumulative running time of the last defrost reaches the first preset running time, at least one last defrost running temperature corresponding to the cumulative running time of the last defrost is obtained; and the running time judgment result is determined based on the last defrost running temperature.

[0032] As an optional implementation, in the first aspect of the present invention, the operating time parameter further includes the current heating operating time;

[0033] And, judging whether the operating time parameter satisfies a preset operating time condition according to the acquired operating time parameter of the air-conditioning system, and obtaining an operating time judgment result includes:

[0034] According to the acquired current heating operation time of the air-conditioning system, determining whether the current heating operation time reaches a second preset operation time;

[0035] If it is determined that the current heating operation duration reaches the second preset operation duration, determining that the current heating operation duration satisfies the operation duration condition corresponding to the current heating operation duration;

[0036] If it is determined that the current heating operation duration has not reached the second preset operation duration, it is determined that the current heating operation duration does not meet the operation duration condition corresponding to the current heating operation duration.

[0037] As an optional embodiment, in the first aspect of the present invention, the method further comprises:

[0038] Acquire a defrost operation parameter set of the air conditioning system during the defrost process, wherein the defrost operation parameter set includes one or more combinations of a temperature parameter of a water tank, a pressure parameter of a temperature control device, a second temperature parameter of the defrost coil, and a continuous operation time parameter of the defrost coil;

[0039] According to at least one parameter in the defrost operation parameter set, determining whether a current condition of the air-conditioning system meets a preset defrost end condition;

[0040] When it is determined that the current condition of the air-conditioning system satisfies the defrost end condition, the air-conditioning system is controlled to end the defrost operation.

[0041] A second aspect of the present invention discloses a defrost control device for an outdoor heat exchanger, the device comprising:

[0042] An acquisition module, used to acquire an environmental parameter of an outdoor unit heat exchanger of an air-conditioning system and a first temperature parameter of a defrost coil of the air-conditioning system;

[0043] A judgment module, used for judging whether the current condition of the air-conditioning system meets the preset defrost entry condition according to the environmental parameter and the first temperature parameter;

[0044] a determination module, configured to determine an operation control parameter of a defrost component of the air-conditioning system when the determination module determines that the current condition of the air-conditioning system satisfies the defrost entry condition, wherein the defrost component includes one or more combinations of a four-way valve, an electronic expansion valve, and a fan;

[0045] The control module is used to control the air conditioning system to perform a defrosting operation on the outdoor unit heat exchanger according to the operation control parameters of the defrosting component.

[0046] As an optional implementation, in the second aspect of the present invention, the judgment module judges whether the current condition of the air-conditioning system meets the preset defrost entry condition according to the environmental parameter and the first temperature parameter, specifically including:

[0047] Determining whether the ambient temperature in the ambient parameters is lower than or equal to a first preset temperature, which is recorded as a first condition;

[0048] According to the acquired operation time parameter of the air conditioning system, determining whether the operation time parameter meets a preset operation time condition, and obtaining an operation time determination result, which is recorded as a second condition;

[0049] According to the ambient temperature, the surface temperature of the outdoor unit heat exchanger included in the ambient parameter, and the coil middle temperature of the defrost coil included in the first temperature parameter, determining whether each of the ambient temperature, the surface temperature, and the coil middle temperature satisfies a corresponding temperature condition, which is recorded as a third condition;

[0050] Among them, when the first condition, the second condition and the third condition are all met, it is determined that the current condition of the air-conditioning system meets the preset defrost entry condition; when at least one of the first condition, the second condition and the third condition is not met, it is determined that the current condition of the air-conditioning system does not meet the preset defrost entry condition.

[0051] As an optional implementation, in the second aspect of the present invention, the judgment module determines whether each of the ambient temperature, the surface temperature and the coil middle temperature meets the corresponding temperature condition according to the ambient temperature, the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the coil middle temperature of the defrost coil included in the first temperature parameter. Specifically, the method includes:

[0052] According to the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the coil middle temperature of the defrost coil included in the first temperature parameter, determining the target component temperature from the surface temperature and the coil middle temperature;

[0053] Determine whether the ambient temperature is within a first preset temperature range, and whether the target component temperature is lower than or equal to a second preset temperature within a first preset duration, which is recorded as a first temperature determination condition; or,

[0054] Determine whether the ambient temperature is within a second preset temperature range, and whether the target component temperature is lower than or equal to a third preset temperature within the first preset duration, which is recorded as a second temperature determination condition; or

[0055] Determine whether the ambient temperature is within a third preset temperature range, and whether the target component temperature is lower than or equal to a fourth preset temperature within the first preset duration, which is recorded as a third temperature determination condition; or,

[0056] Determining whether the ambient temperature is within a fourth preset temperature range, and whether the temperature of the target component is lower than or equal to a fifth preset temperature within the first preset duration, which is recorded as a fourth temperature determination condition;

[0057] Among them, when one of the first temperature judgment condition, the second temperature judgment condition, the third temperature judgment condition and the fourth temperature judgment condition is met, it is determined that each of the ambient temperature, the surface temperature and the middle temperature of the coil meets the corresponding temperature condition.

[0058] As an optional implementation, in the second aspect of the present invention, the judgment module determines the target component temperature from the surface temperature and the coil middle temperature according to the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the coil middle temperature of the defrost coil included in the first temperature parameter, specifically including:

[0059] According to the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the middle temperature of the coil of the defrost coil included in the first temperature parameter, the surface temperature and the middle temperature of the coil are compared to obtain a temperature comparison result;

[0060] When the temperature comparison result indicates that the middle temperature of the coil is lower than the surface temperature within a second preset duration, determining the middle temperature of the coil as the target component temperature;

[0061] When the temperature comparison result indicates that the surface temperature is lower than or equal to the middle temperature of the coil within the second preset duration, the surface temperature is determined as the target component temperature.

[0062] As an optional implementation, in the second aspect of the present invention, the operating time parameter includes the cumulative operating time of the last defrost;

[0063] Furthermore, the judging module judges whether the acquired running time parameter of the air-conditioning system satisfies a preset running time condition according to the running time parameter, and the method of obtaining the running time judgment result specifically includes:

[0064] According to the acquired accumulated operation time of the last defrost of the air-conditioning system, determining whether the accumulated operation time of the last defrost reaches a first preset operation time;

[0065] If it is determined that the last defrost cumulative operation time has not reached the first preset operation time, determining that the last defrost cumulative operation time does not meet the operation time condition corresponding to the last defrost cumulative operation time;

[0066] If it is determined that the cumulative running time of the last defrost reaches the first preset running time, it is determined that the cumulative running time of the last defrost satisfies the running time condition corresponding to the cumulative running time of the last defrost; or

[0067] If it is determined that the cumulative running time of the last defrost reaches the first preset running time, at least one last defrost running temperature corresponding to the cumulative running time of the last defrost is obtained; and the running time judgment result is determined based on the last defrost running temperature.

[0068] As an optional implementation, in the second aspect of the present invention, the operating time parameter further includes the current heating operating time;

[0069] Furthermore, the judging module judges whether the acquired running time parameter of the air-conditioning system satisfies a preset running time condition according to the running time parameter, and the method of obtaining the running time judgment result specifically includes:

[0070] According to the acquired current heating operation time of the air-conditioning system, determining whether the current heating operation time reaches a second preset operation time;

[0071] If it is determined that the current heating operation duration reaches the second preset operation duration, determining that the current heating operation duration satisfies the operation duration condition corresponding to the current heating operation duration;

[0072] If it is determined that the current heating operation duration has not reached the second preset operation duration, it is determined that the current heating operation duration does not meet the operation duration condition corresponding to the current heating operation duration.

[0073] As an optional embodiment, in the second aspect of the present invention, the acquisition module is further used to acquire a defrost operation parameter set of the air-conditioning system during the defrost process, wherein the defrost operation parameter set includes a temperature parameter of the water tank, a pressure parameter of the temperature control device, a second temperature parameter of the defrost coil, and a combination of one or more continuous operation time parameters of the defrost coil;

[0074] The judgment module is further used to judge whether the current condition of the air-conditioning system meets the preset defrost end condition according to at least one parameter in the defrost operation parameter set;

[0075] The control module is further configured to control the air conditioning system to end the defrost operation when it is determined that the current condition of the air conditioning system meets the defrost end condition.

[0076] A third aspect of the present invention discloses another defrost control device for an outdoor heat exchanger, the device comprising:

[0077] A memory storing executable program code;

[0078] a processor coupled to the memory;

[0079] The processor calls the executable program code stored in the memory to execute the defrost control method for the outdoor unit heat exchanger disclosed in the first aspect of the present invention.

[0080] A fourth aspect of the present invention discloses a computer storage medium, wherein the computer storage medium stores computer instructions, and when the computer instructions are called, they are used to execute the defrost control method for the outdoor unit heat exchanger disclosed in the first aspect of the present invention.

[0081] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0082] In an embodiment of the present invention, environmental parameters of an outdoor unit heat exchanger of an air-conditioning system and a first temperature parameter of a defrost coil of the air-conditioning system are obtained; based on the environmental parameters and the temperature parameters, it is determined whether the current conditions of the air-conditioning system meet the preset defrost entry conditions; when it is determined that the current conditions of the air-conditioning system meet the defrost entry conditions, the operating control parameters of a defrost component of the air-conditioning system are determined, the defrost component including one or more combinations of a four-way valve, an electronic expansion valve and a fan; based on the operating control parameters of the defrost component, the air-conditioning system is controlled to perform a defrost operation on the outdoor unit heat exchanger. It can be seen that the implementation of the present invention can determine whether the current condition of the air-conditioning system meets the preset defrost entry condition based on the acquired environmental parameters of the outdoor unit heat exchanger of the air-conditioning system and the first temperature parameter of the defrost coil of the air-conditioning system; and when it is determined that the current condition of the air-conditioning system meets the defrost entry condition, automatically determine the operation control parameters of the defrost component of the air-conditioning system, which can improve the accuracy and efficiency of judging whether the system meets the defrost entry condition based on a variety of air-conditioning system parameters, and is conducive to improving the accuracy and efficiency of determining the operation control parameters of the defrost component; and then control the air-conditioning system to perform a defrost operation on the outdoor unit heat exchanger according to the operation control parameters of the defrost component, which can improve the accuracy of the defrost control of the outdoor unit, and can improve the defrost efficiency of the outdoor unit, which is conducive to achieving a good defrost effect, thereby facilitating the normal operation of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0084] Figure 1 It is a flow chart of a defrosting control method for an outdoor unit heat exchanger disclosed in an embodiment of the present invention;

[0085] Figure 2 It is a flow chart of another defrosting control method for an outdoor heat exchanger disclosed in an embodiment of the present invention;

[0086] Figure 3 It is a structural schematic diagram of a defrost control device for an outdoor unit heat exchanger disclosed in an embodiment of the present invention;

[0087] Figure 4 It is a structural schematic diagram of another defrost control device for an outdoor unit heat exchanger disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0088] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0089] The terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, device, product or end including a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products or ends.

[0090] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0091] The present invention discloses a defrost control method and device for an outdoor heat exchanger, which can judge whether the current condition of the air conditioning system meets the preset defrost entry condition according to the acquired environmental parameters of the outdoor heat exchanger of the air conditioning system and the first temperature parameter of the defrost coil of the air conditioning system; and when it is judged that the current condition of the air conditioning system meets the defrost entry condition, automatically determine the operation control parameters of the defrost component of the air conditioning system, which can improve the judgment accuracy and efficiency of whether the system meets the defrost entry condition based on the diversified air conditioning system parameters, and is conducive to improving the determination accuracy and efficiency of the operation control parameters of the defrost component; and then according to the operation control parameters of the defrost component, control the air conditioning system to perform a defrost operation on the outdoor heat exchanger, which can improve the defrost control accuracy of the outdoor unit, and can improve the defrost efficiency of the outdoor unit, which is conducive to achieving a good defrost effect, thereby facilitating the normal operation of the air conditioning system. The following are detailed descriptions.

[0092] Embodiment 1

[0093] See also Figure 1 , Figure 1 1 is a flow chart of a defrosting control method for an outdoor heat exchanger disclosed in an embodiment of the present invention. Figure 1 The defrost control method for an outdoor heat exchanger described herein may be applied to a defrost control device for an outdoor heat exchanger, wherein the device may include a control device or a control server, wherein the control server may include a cloud server or a local server, which is not limited in the embodiments of the present invention. Figure 1 As shown, the defrost control method of the outdoor unit heat exchanger may include the following operations:

[0094] 101. Obtain environmental parameters of an outdoor unit heat exchanger of an air-conditioning system and a first temperature parameter of a defrost coil of the air-conditioning system.

[0095] In the embodiment of the present invention, optionally, the environmental parameter of the outdoor heat exchanger may include the ambient temperature of the environment in which the outdoor heat exchanger is located, and may also include the surface temperature of the outdoor heat exchanger. The first temperature parameter of the defrost coil may include the middle temperature of the defrost coil, and may also include the temperature of other parts of the defrost coil, which is not limited in the embodiment of the present invention.

[0096] 102. Determine whether current conditions of the air-conditioning system meet preset defrost entry conditions based on the environmental parameters and the first temperature parameter.

[0097] In an embodiment of the present invention, the defrost entry conditions may include the ambient temperature being lower than or equal to a first preset temperature, the system operating time reaching a preset operating time, and the ambient temperature being in a preset temperature range and the surface temperature / coil middle temperature being lower than or equal to a second preset temperature.

[0098] In an embodiment of the present invention, when the judgment result of step 102 is yes, that is, when it is judged that the current conditions of the air-conditioning system meet the defrost entry conditions, step 103 is triggered to be executed; when the judgment result of step 102 is no, the present process can be terminated, and the air-conditioning system can continue to operate according to the current operating mode, which is not limited by the embodiment of the present invention.

[0099] 103. Determine the operating control parameters of the defrost components of the air conditioning system.

[0100] In an embodiment of the present invention, the defrost assembly may include one or more combinations of a four-way valve, an electronic expansion valve, and a fan. The operation control parameters of the defrost assembly may include one or more combinations of a switching control parameter of the four-way valve, an opening control parameter of the electronic expansion valve, and an air outlet control parameter of the fan.

[0101] 104. According to the operation control parameters of the defrost component, control the air conditioning system to perform a defrost operation on the outdoor unit heat exchanger.

[0102] For example, at the beginning of defrosting, the compressor is stopped and the four-way valve is switched, so that the four-way valve is switched within 5 seconds after the compressor is stopped; during the refrigerant removal process within the defrosting process, the enthalpy-increasing electronic expansion valve is opened during the refrigerant removal period according to the conditions of the electronic expansion valve opening (Td) and the liquid pipe opening (Td-Tliquid pipe) corresponding to the electronic expansion valve. When Td>70℃ and Td-Tliquid pipe>30℃, the enthalpy-increasing electronic expansion valve is opened according to the opening before defrosting; in the frequency reduction process of entering and exiting defrosting, the four-way valve is switched 30 seconds after the compressor frequency drops to 0; during defrosting, all terminals are shut down, the corresponding solenoid valves are closed, the liquid circuit solenoid valves are closed at the same time, and the defrost solenoid valve is opened.

[0103] It can be seen that implementation Figure 1 The described defrost control method for the outdoor unit heat exchanger can determine whether the current condition of the air-conditioning system meets the preset defrost entry condition based on the acquired environmental parameters of the outdoor unit heat exchanger of the air-conditioning system and the first temperature parameter of the defrost coil of the air-conditioning system; and when it is determined that the current condition of the air-conditioning system meets the defrost entry condition, automatically determine the operation control parameters of the defrost component of the air-conditioning system, which can improve the accuracy and efficiency of judging whether the system meets the defrost entry condition based on a variety of air-conditioning system parameters, and is conducive to improving the accuracy and efficiency of determining the operation control parameters of the defrost component; and then control the air-conditioning system to perform a defrost operation on the outdoor unit heat exchanger based on the operation control parameters of the defrost component, which can improve the accuracy of the defrost control of the outdoor unit, and can improve the defrost efficiency of the outdoor unit, which is conducive to achieving a good defrost effect, thereby facilitating the normal operation of the air-conditioning system.

[0104] In an optional embodiment, the above step 102 of determining whether the current condition of the air-conditioning system meets the preset defrost entry condition according to the environmental parameter and the first temperature parameter may include:

[0105] Determine whether the ambient temperature in the environmental parameters is lower than or equal to a first preset temperature, which is recorded as a first condition;

[0106] According to the acquired operation time parameter of the air conditioning system, it is judged whether the operation time parameter meets the preset operation time condition, and the operation time judgment result is obtained, which is recorded as the second condition;

[0107] According to the ambient temperature, the surface temperature of the outdoor unit heat exchanger included in the ambient parameters, and the coil middle temperature of the defrost coil included in the first temperature parameter, it is determined whether each of the ambient temperature, the surface temperature, and the coil middle temperature satisfies the corresponding temperature condition, which is recorded as the third condition;

[0108] Among them, when the first condition, the second condition and the third condition are all met, it is determined that the current condition of the air-conditioning system meets the preset defrost entry condition; when at least one of the first condition, the second condition and the third condition is not met, it is determined that the current condition of the air-conditioning system does not meet the preset defrost entry condition.

[0109] In the embodiment of the present invention, specifically, the method may further include:

[0110] Detect whether the air conditioning system is currently in the capacity test mode;

[0111] When it is detected that the air conditioning system is not currently in the capacity test mode, it is determined that the operating time parameter of the air conditioning system needs to be judged (that is, the judgment operation corresponding to the second condition needs to be performed);

[0112] When it is detected that the air-conditioning system is currently in the capacity test mode, it is determined that there is no need to judge the operating time parameter of the air-conditioning system (that is, there is no need to perform the judgment operation corresponding to the second condition).

[0113] In this optional embodiment, when the air-conditioning system enters the capacity test mode, the first power-on timing is invalid. At this time, when the first condition and the third condition are both met, it is determined that the current condition of the air-conditioning system meets the preset defrost entry condition; when at least one of the first condition and the third condition is not met, it is determined that the current condition of the air-conditioning system does not meet the preset defrost entry condition.

[0114] In the embodiment of the present invention, optionally, the first preset temperature may be 21°C, or 22°C, or any other preset value. The operating duration condition may be a condition that the operating duration parameter reaches a preset duration. The temperature condition corresponding to each temperature may be a condition that the temperature is in a corresponding temperature range, or a condition that the temperature is lower than or equal to the corresponding temperature, or a condition that the comparison result of the temperature with other temperatures is a preset result, which is not limited in the embodiment of the present invention.

[0115] It can be seen that this optional embodiment can determine whether the ambient temperature in the environmental parameters is lower than or equal to the first preset temperature, which is recorded as the first condition; and according to the acquired operating time parameters of the air-conditioning system, determine whether the operating time parameters meet the preset operating time conditions, and obtain the operating time judgment result, which is recorded as the second condition; and according to the ambient temperature, the surface temperature of the outdoor unit heat exchanger included in the environmental parameters and the coil middle temperature of the defrost coil included in the first temperature parameter, determine whether each of the ambient temperature, the surface temperature and the coil middle temperature meets the corresponding temperature conditions, which is recorded as the third condition; when the first condition, the second condition and the third condition are all met, it is determined that the air-conditioning system currently meets the defrost entry condition, which can improve the determination efficiency, accuracy and reliability of the air-conditioning system meeting the defrost entry condition; when at least one of the first condition, the second condition and the third condition is not met, it is directly determined that the current condition of the air-conditioning system does not meet the defrost entry condition, which can improve the determination speed and efficiency of the air-conditioning system not meeting the defrost entry condition, which is conducive to improving the accuracy and efficiency of judging whether the air-conditioning system meets the defrost entry condition based on the determination of multiple air-conditioning parameters.

[0116] In this optional embodiment, as an optional implementation, judging whether each of the ambient temperature, the surface temperature and the coil middle temperature satisfies the corresponding temperature condition according to the ambient temperature, the surface temperature of the outdoor unit heat exchanger included in the ambient parameter and the coil middle temperature of the defrost coil included in the first temperature parameter may include:

[0117] According to the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the coil middle temperature of the defrost coil included in the first temperature parameter, the target component temperature is determined from the surface temperature and the coil middle temperature;

[0118] Determine whether the ambient temperature is within a first preset temperature range, and whether the target component temperature is lower than or equal to a second preset temperature within a first preset duration, which is recorded as a first temperature determination condition; or,

[0119] Determine whether the ambient temperature is within the second preset temperature range, and whether the target component temperature is lower than or equal to the third preset temperature within the first preset duration, which is recorded as the second temperature determination condition; or,

[0120] Determine whether the ambient temperature is within a third preset temperature range, and whether the target component temperature is lower than or equal to a fourth preset temperature within a first preset duration, which is recorded as a third temperature determination condition; or,

[0121] Determine whether the ambient temperature is within a fourth preset temperature range, and whether the target component temperature is lower than or equal to a fifth preset temperature within the first preset duration, which is recorded as a fourth temperature determination condition;

[0122] When one of the first temperature judgment condition, the second temperature judgment condition, the third temperature judgment condition and the fourth temperature judgment condition is met, it is determined that each of the ambient temperature, the surface temperature and the middle temperature of the coil meets the corresponding temperature condition.

[0123] In an embodiment of the present invention, when the first temperature judgment condition, the second temperature judgment condition, the third temperature judgment condition and the fourth temperature judgment condition are all not met, it is determined that each of the ambient temperature, the surface temperature and the middle temperature of the coil does not meet the corresponding temperature condition.

[0124] For example, the target component temperature is the surface temperature T of the outdoor unit heat exchanger. def For example, the ambient temperature T ao and surface temperature T def The expression satisfying the first temperature judgment condition A, the second temperature judgment condition B, the third temperature judgment condition C and the fourth temperature judgment condition D can be shown as follows:

[0125] A: [(a-6)℃ / c]<T ao ≤15℃;T def ≤-6℃+T def Correct the parameters and last for 3 minutes;

[0126] B: [(a-14)℃ / c]<T ao ≤[(a-6)℃ / c]; T def ≤c×T ao -a+T def Correct the parameters and last for 3 minutes;

[0127] C: -12℃<T ao ≤[(a-14)℃ / c]; T def ≤c×T ao -a+T def Correct the parameters and last for 3 minutes; and this condition occurs when the cumulative duration of the defrost operation reaches 90 minutes;

[0128] D:T ao ≤-12℃; T def ≤-17.6℃+T def Correct the parameters and last for 3 minutes; and this condition occurs when the cumulative duration of the defrost operation reaches 120 minutes.

[0129] For example, a=8; when Tao ≥ 0°C, c=0.6; when T ao When <0℃, c=0.8; T defThe correction parameter defaults to 0°C; that is, the first preset temperature interval is (3.3°C, 15°C], the second preset temperature interval is (-7.5°C, 3.3°C], the third preset temperature interval is (-12°C, -7.5°C], and the fourth preset temperature interval is (-∞, -12°C].

[0130] It should be noted that if the defrost process encounters shutdown, temperature point shutdown, or fault shutdown, the defrost cumulative time will not be reset. If the defrost process encounters normal shutdown, the defrost cumulative time will not be reset, which can prevent the air conditioning system from entering the defrost mode due to frequent startup and shutdown.

[0131] It can be seen that this optional implementation can determine the target component temperature from the surface temperature and the middle temperature of the coil according to the surface temperature of the outdoor unit heat exchanger included in the environmental parameters and the middle temperature of the coil of the defrost coil included in the first temperature parameter, which can improve the accuracy and efficiency of determining the target component temperature used as a basis for temperature judgment, and then judge whether the ambient temperature is in the first preset temperature range, and whether the target component temperature is lower than or equal to the second preset temperature within the first preset duration, which is recorded as the first temperature judgment condition; or, judge whether the ambient temperature is in the second preset temperature range, and whether the target component temperature is lower than or equal to the third preset temperature within the first preset duration, which is recorded as the second temperature judgment condition; or, judge whether the ambient temperature is in the third preset temperature range, and whether the ambient temperature is in the third preset temperature range, and whether the ambient temperature is in the fourth preset temperature range. Whether the temperature of the target component is lower than or equal to the fourth preset temperature within a preset duration is recorded as the third temperature judgment condition; or, whether the ambient temperature is in the fourth preset temperature range, and whether the temperature of the target component is lower than or equal to the fifth preset temperature within the first preset duration is recorded as the fourth temperature judgment condition, and when one of the temperature judgment conditions is met, it is directly determined that each temperature meets the corresponding temperature condition. By providing multiple temperature judgment conditions, the flexibility and diversity of judging whether the ambient temperature and the temperature of the target component meet the corresponding temperature conditions can be improved, and the accuracy and reliability of judging whether the ambient temperature and the temperature of the target component meet the corresponding temperature conditions can be improved, which is conducive to improving the accuracy of judging whether the current conditions of the subsequent air-conditioning system meet the preset defrost entry conditions.

[0132] In this optional embodiment, optionally, according to the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the middle temperature of the coil of the defrost coil included in the first temperature parameter, the target component temperature is determined from the surface temperature and the middle temperature of the coil, including:

[0133] According to the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the middle temperature of the defrost coil included in the first temperature parameter, the surface temperature and the middle temperature of the coil are compared to obtain a temperature comparison result;

[0134] When the temperature comparison result indicates that the middle temperature of the coil is lower than the surface temperature within the second preset duration, the middle temperature of the coil is determined as the target component temperature;

[0135] When the temperature comparison result indicates that the surface temperature is lower than or equal to the temperature in the middle of the coil within the second preset duration, the surface temperature is determined as the target component temperature.

[0136] In the embodiment of the present invention, when the air conditioning system is in a normal heating state, if the middle temperature of the coil T cm <T def And it lasts for a second preset time (such as 5 seconds), then Tcm is used to determine whether to enter defrost. def ≤T cm , the temperature in the middle of the coil is used to determine whether to enter defrost.

[0137] It can be seen that this optional implementation can also compare the surface temperature and the middle temperature of the coil based on the surface temperature of the outdoor unit heat exchanger included in the environmental parameters and the middle temperature of the coil of the defrost coil included in the first temperature parameter, and when the temperature comparison result is used to indicate that the middle temperature of the coil is lower than the surface temperature within the second preset duration, the middle temperature of the coil is determined as the target component temperature; and when the temperature comparison result is used to indicate that the surface temperature is lower than or equal to the middle temperature of the coil within the second preset duration, the surface temperature is determined as the target component temperature, which can improve the accuracy and reliability of determining the target component temperature based on the comparison result of the surface temperature and the middle temperature of the coil.

[0138] In this optional embodiment, the operating time parameter may include the cumulative operating time of the last defrost. And, according to the acquired operating time parameter of the air-conditioning system, it is judged whether the operating time parameter meets the preset operating time condition, and the operating time judgment result is obtained, including:

[0139] According to the acquired accumulated operation time of the last defrost of the air-conditioning system, determining whether the accumulated operation time of the last defrost reaches a first preset operation time;

[0140] If it is determined that the cumulative running time of the last defrost has not reached the first preset running time, it is determined that the cumulative running time of the last defrost does not meet the running time condition corresponding to the cumulative running time of the last defrost;

[0141] If it is determined that the cumulative running time of the last defrost reaches the first preset running time, it is determined that the cumulative running time of the last defrost satisfies the running time condition corresponding to the cumulative running time of the last defrost; or,

[0142] If it is determined that the cumulative running time of the last defrost reaches the first preset running time, at least one last defrost running temperature corresponding to the cumulative running time of the last defrost is obtained; and the running time judgment result is determined according to the last defrost running temperature.

[0143] In the embodiment of the present invention, optionally, the first preset running time may be 50 minutes, or 55 minutes, or any other set value.

[0144] In the embodiment of the present invention, specifically, determining the operation time judgment result according to the last defrosting operation temperature may include:

[0145] According to the last defrost operation temperature, determining whether the last defrost entry condition of the air conditioning system includes one of the first temperature judgment condition, the second temperature judgment condition and the third temperature judgment condition;

[0146] When it is determined that the last defrost entry condition of the air-conditioning system includes one of the first temperature judgment condition, the second temperature judgment condition and the third temperature judgment condition, determining that the last defrost cumulative operation time satisfies the operation time condition corresponding to the last defrost cumulative operation time;

[0147] When it is determined that the last defrost entry conditions of the air-conditioning system do not include the first temperature judgment condition, the second temperature judgment condition and the third temperature judgment condition, it is determined that the accumulated time of the last defrost operation does not meet the operation time condition corresponding to the accumulated time of the last defrost operation.

[0148] It can be seen that this optional implementation manner can also, when the running time parameter includes the cumulative running time of the last defrost, determine whether the cumulative running time of the last defrost has reached the first preset running time based on the cumulative running time of the last defrost of the air-conditioning system; if it is determined that the first preset running time has not been reached, it is directly determined that the cumulative running time of the last defrost does not meet the running time condition corresponding to the cumulative running time of the last defrost, thereby improving the efficiency and accuracy of determining that the cumulative running time of the last defrost does not meet the corresponding running time condition; if it is determined that the first preset running time has been reached, it is directly determined that the cumulative running time of the last defrost meets the running time condition of the last defrost. The operation time condition corresponding to the cumulative defrost operation time improves the efficiency and speed of determining whether the cumulative time of the last defrost operation meets the corresponding operation time condition; or, if it is judged that the first preset operation time is reached, at least one last defrost operation temperature corresponding to the cumulative operation time of the last defrost is obtained; and according to the last defrost operation temperature, the operation time judgment result is determined, which improves the accuracy and reliability of determining whether the cumulative time of the last defrost operation meets the corresponding operation time condition, and through a variety of judgment methods of the last defrost parameters, the diversity and flexibility of judging whether the cumulative time of the last defrost operation meets the corresponding operation time condition can be improved.

[0149] In this optional embodiment, as an optional implementation, the operation duration parameter also includes the current heating operation duration. And, according to the acquired operation duration parameter of the air-conditioning system, it is judged whether the operation duration parameter meets the preset operation duration condition, and the operation duration judgment result is obtained, including:

[0150] According to the acquired current heating operation time of the air-conditioning system, determining whether the current heating operation time reaches a second preset operation time;

[0151] If it is determined that the current heating operation duration reaches the second preset operation duration, determining that the current heating operation duration satisfies the operation duration condition corresponding to the current heating operation duration;

[0152] If it is determined that the current heating operation duration has not reached the second preset operation duration, it is determined that the current heating operation duration does not meet the operation duration condition corresponding to the current heating operation duration.

[0153] In the embodiment of the present invention, optionally, the second preset running time may be 33 minutes, or 30 minutes, or any other set value, which is not limited in the embodiment of the present invention.

[0154] It can be seen that this optional implementation can, when the operation duration parameter includes the current heating operation duration, determine whether the current heating operation duration has reached the second preset operation duration based on the current heating operation duration of the air-conditioning system; if it is determined that the second preset operation duration has been reached, it is determined that the current heating operation duration meets the operation duration condition corresponding to the current heating operation duration, thereby improving the accuracy and reliability of determining whether the current heating operation duration meets the corresponding operation duration condition; if it is determined that the current heating operation duration has not yet reached the second preset operation duration, it is determined that the current heating operation duration does not meet the operation duration condition corresponding to the current heating operation duration, thereby improving the accuracy and reliability of determining that the current heating operation duration does not meet the corresponding operation duration condition.

[0155] Embodiment 2

[0156] See also Figure 2 , Figure 2 1 is a flow chart of a defrosting control method for an outdoor heat exchanger disclosed in an embodiment of the present invention. Figure 2 The defrost control method for an outdoor heat exchanger described herein may be applied to a defrost control device for an outdoor heat exchanger, wherein the device may include a control device or a control server, wherein the control server may include a cloud server or a local server, which is not limited in the embodiments of the present invention. Figure 2 As shown, the defrost control method of the outdoor unit heat exchanger may include the following operations:

[0157] 201. Obtain environmental parameters of an outdoor unit heat exchanger of an air-conditioning system and a first temperature parameter of a defrost coil of the air-conditioning system.

[0158] 202. Determine whether current conditions of the air-conditioning system meet preset defrost entry conditions based on the environmental parameters and the first temperature parameter.

[0159] In an embodiment of the present invention, when the judgment result of the above step 202 is yes, that is, when it is judged that the current condition of the air-conditioning system meets the defrost entry condition, step 203 can be triggered for execution; when the judgment result of the above step 202 is no, that is, when it is judged that the current condition of the air-conditioning system does not meet the defrost entry condition, this process can be terminated, and the embodiment of the present invention is not limited.

[0160] 203. Determine the operating control parameters of the defrost component of the air conditioning system.

[0161] 204. According to the operation control parameters of the defrost component, control the air conditioning system to perform a defrost operation on the outdoor unit heat exchanger.

[0162] In the embodiment of the present invention, for other descriptions of step 201 to step 204, please refer to the detailed description of step 101 to step 104 in the first embodiment, and the embodiment of the present invention will not be repeated here.

[0163] 205. Obtain a set of defrost operation parameters of the air conditioning system during the defrost process.

[0164] In the embodiment of the present invention, optionally, the defrost operation parameter set may include one or more combinations of a temperature parameter of the water tank, a pressure parameter of the temperature control device, a second temperature parameter of the defrost coil, and a continuous operation time parameter of the defrost coil.

[0165] 206. Determine whether a current condition of the air-conditioning system satisfies a preset defrost end condition based on at least one parameter in the defrost operation parameter set.

[0166] In an embodiment of the present invention, specifically, the defrost end condition may be a condition that at least one parameter in the defrost operation parameter set reaches a preset numerical value corresponding to the parameter, for example: defrosting can be ended when the water tank temperature reaches 10°C, and / or defrosting can be ended when the pressure of the temperature control device reaches 3-5 bar.

[0167] In an embodiment of the present invention, when the judgment result of step 206 is yes, that is, when it is judged that the current conditions of the air-conditioning system meet the defrost end conditions, step 207 can be triggered; when the judgment result of step 206 is no, the above step 204 can continue to be executed.

[0168] 207. Control the air conditioning system to end the defrosting operation.

[0169] In an embodiment of the present invention, when the air-conditioning system is controlled to end the defrost operation, the air-conditioning system can be re-controlled to perform operations corresponding to the operating mode according to the operating mode of the air-conditioning system before the defrost operation. For example, before defrosting, if the air-conditioning system is in the cooling mode, the air-conditioning system continues to be controlled to perform the cooling operation.

[0170] It can be seen that implementation Figure 2 The described defrost control method for the outdoor unit heat exchanger can determine whether the current condition of the air-conditioning system meets the preset defrost entry condition based on the acquired environmental parameters of the outdoor unit heat exchanger of the air-conditioning system and the first temperature parameter of the defrost coil of the air-conditioning system; and when it is determined that the current condition of the air-conditioning system meets the defrost entry condition, automatically determine the operation control parameters of the defrost component of the air-conditioning system, which can improve the accuracy and efficiency of judging whether the system meets the defrost entry condition based on a variety of air-conditioning system parameters, and is conducive to improving the accuracy and efficiency of determining the operation control parameters of the defrost component; and then control the air-conditioning system to perform a defrost operation on the outdoor unit heat exchanger based on the operation control parameters of the defrost component, which can improve the accuracy of the defrost control of the outdoor unit, and can improve the defrost efficiency of the outdoor unit, which is conducive to achieving a good defrost effect, thereby facilitating the normal operation of the air-conditioning system. In addition, it is also possible to timely obtain at least one defrost operating parameter of the air-conditioning system during the defrost process, such as: water tank temperature, temperature control equipment pressure, defrost coil temperature and its continuous operation duration, etc., and judge whether the air-conditioning system currently meets the defrost termination conditions based on at least one defrost operating parameter. If so, the air-conditioning system is controlled to end the defrost operation, which can improve the control flexibility, accuracy and reliability of the defrost termination operation based on a variety of defrost operating parameters.

[0171] Embodiment 3

[0172] See also Figure 3 , Figure 3 1 is a schematic diagram of the structure of a defrost control device for an outdoor heat exchanger disclosed in an embodiment of the present invention. Figure 3 The described defrost control device for the outdoor heat exchanger may include a control device or a control server, wherein the control server may include a cloud server or a local server, which is not limited in the embodiment of the present invention. Figure 3 As shown, the defrost control device of the outdoor unit heat exchanger may include:

[0173] An acquisition module 301 is used to acquire an environmental parameter of an outdoor unit heat exchanger of an air-conditioning system and a first temperature parameter of a defrost coil of the air-conditioning system;

[0174] The judgment module 302 is used to judge whether the current condition of the air-conditioning system meets the preset defrost entry condition according to the environmental parameter and the first temperature parameter;

[0175] The determination module 303 is used to determine the operation control parameters of the defrost component of the air-conditioning system when the determination module 302 determines that the current condition of the air-conditioning system meets the defrost entry condition, and the defrost component includes a combination of one or more of a four-way valve, an electronic expansion valve and a fan;

[0176] The control module 304 is used to control the air conditioning system to perform a defrosting operation on the outdoor unit heat exchanger according to the operation control parameters of the defrosting component.

[0177] It can be seen that implementation Figure 3 The described defrost control device for the outdoor unit heat exchanger can determine whether the current conditions of the air-conditioning system meet the preset defrost entry conditions based on the acquired environmental parameters of the outdoor unit heat exchanger of the air-conditioning system and the first temperature parameters of the defrost coil of the air-conditioning system; and when it is determined that the current conditions of the air-conditioning system meet the defrost entry conditions, automatically determine the operating control parameters of the defrost component of the air-conditioning system, which can improve the accuracy and efficiency of judging whether the system meets the defrost entry conditions based on a variety of air-conditioning system parameters, and is conducive to improving the accuracy and efficiency of determining the operating control parameters of the defrost component; and then control the air-conditioning system to perform a defrost operation on the outdoor unit heat exchanger based on the operating control parameters of the defrost component, which can improve the accuracy of the defrost control of the outdoor unit, and can improve the defrost efficiency of the outdoor unit, which is conducive to achieving a good defrost effect, thereby facilitating the normal operation of the air-conditioning system.

[0178] In an optional embodiment, the judgment module 302 judges whether the current condition of the air-conditioning system meets the preset defrost entry condition according to the environmental parameter and the first temperature parameter, and the method may specifically include:

[0179] Determine whether the ambient temperature in the environmental parameters is lower than or equal to a first preset temperature, which is recorded as a first condition;

[0180] According to the acquired operation time parameter of the air conditioning system, it is judged whether the operation time parameter meets the preset operation time condition, and the operation time judgment result is obtained, which is recorded as the second condition;

[0181] According to the ambient temperature, the surface temperature of the outdoor unit heat exchanger included in the ambient parameters, and the coil middle temperature of the defrost coil included in the first temperature parameter, it is determined whether each of the ambient temperature, the surface temperature, and the coil middle temperature satisfies the corresponding temperature condition, which is recorded as the third condition;

[0182] Among them, when the first condition, the second condition and the third condition are all met, it is determined that the current condition of the air-conditioning system meets the preset defrost entry condition; when at least one of the first condition, the second condition and the third condition is not met, it is determined that the current condition of the air-conditioning system does not meet the preset defrost entry condition.

[0183] It can be seen that this optional embodiment can determine whether the ambient temperature in the environmental parameters is lower than or equal to the first preset temperature, which is recorded as the first condition; and according to the acquired operating time parameters of the air-conditioning system, determine whether the operating time parameters meet the preset operating time conditions, and obtain the operating time judgment result, which is recorded as the second condition; and according to the ambient temperature, the surface temperature of the outdoor unit heat exchanger included in the environmental parameters and the coil middle temperature of the defrost coil included in the first temperature parameter, determine whether each of the ambient temperature, the surface temperature and the coil middle temperature meets the corresponding temperature conditions, which is recorded as the third condition; when the first condition, the second condition and the third condition are all met, it is determined that the air-conditioning system currently meets the defrost entry condition, which can improve the determination efficiency, accuracy and reliability of the air-conditioning system meeting the defrost entry condition; when at least one of the first condition, the second condition and the third condition is not met, it is directly determined that the current condition of the air-conditioning system does not meet the defrost entry condition, which can improve the determination speed and efficiency of the air-conditioning system not meeting the defrost entry condition, which is conducive to improving the accuracy and efficiency of judging whether the air-conditioning system meets the defrost entry condition based on the determination of multiple air-conditioning parameters.

[0184] In this optional embodiment, as an optional implementation, the judgment module 302 judges whether each of the ambient temperature, the surface temperature and the coil middle temperature meets the corresponding temperature condition according to the ambient temperature, the surface temperature of the outdoor unit heat exchanger included in the environmental parameters and the coil middle temperature of the defrost coil included in the first temperature parameter. Specifically, the method may include:

[0185] According to the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the coil middle temperature of the defrost coil included in the first temperature parameter, the target component temperature is determined from the surface temperature and the coil middle temperature;

[0186] Determine whether the ambient temperature is within a first preset temperature range, and whether the target component temperature is lower than or equal to a second preset temperature within a first preset duration, which is recorded as a first temperature determination condition; or,

[0187] Determine whether the ambient temperature is within the second preset temperature range, and whether the target component temperature is lower than or equal to the third preset temperature within the first preset duration, which is recorded as the second temperature determination condition; or,

[0188] Determine whether the ambient temperature is within a third preset temperature range, and whether the target component temperature is lower than or equal to a fourth preset temperature within a first preset duration, which is recorded as a third temperature determination condition; or,

[0189] Determine whether the ambient temperature is within a fourth preset temperature range, and whether the target component temperature is lower than or equal to a fifth preset temperature within the first preset duration, which is recorded as a fourth temperature determination condition;

[0190] When one of the first temperature judgment condition, the second temperature judgment condition, the third temperature judgment condition and the fourth temperature judgment condition is met, it is determined that each of the ambient temperature, the surface temperature and the middle temperature of the coil meets the corresponding temperature condition.

[0191] It can be seen that this optional implementation can determine the target component temperature from the surface temperature and the middle temperature of the coil according to the surface temperature of the outdoor unit heat exchanger included in the environmental parameters and the middle temperature of the coil of the defrost coil included in the first temperature parameter, which can improve the accuracy and efficiency of determining the target component temperature used as a basis for temperature judgment, and then judge whether the ambient temperature is in the first preset temperature range, and whether the target component temperature is lower than or equal to the second preset temperature within the first preset duration, which is recorded as the first temperature judgment condition; or, judge whether the ambient temperature is in the second preset temperature range, and whether the target component temperature is lower than or equal to the third preset temperature within the first preset duration, which is recorded as the second temperature judgment condition; or, judge whether the ambient temperature is in the third preset temperature range, and whether the ambient temperature is in the third preset temperature range, and whether the ambient temperature is in the fourth preset temperature range. Whether the temperature of the target component is lower than or equal to the fourth preset temperature within a preset duration is recorded as the third temperature judgment condition; or, whether the ambient temperature is in the fourth preset temperature range, and whether the temperature of the target component is lower than or equal to the fifth preset temperature within the first preset duration is recorded as the fourth temperature judgment condition, and when one of the temperature judgment conditions is met, it is directly determined that each temperature meets the corresponding temperature condition. By providing multiple temperature judgment conditions, the flexibility and diversity of judging whether the ambient temperature and the temperature of the target component meet the corresponding temperature conditions can be improved, and the accuracy and reliability of judging whether the ambient temperature and the temperature of the target component meet the corresponding temperature conditions can be improved, which is conducive to improving the accuracy of judging whether the current conditions of the subsequent air-conditioning system meet the preset defrost entry conditions.

[0192] In this optional embodiment, optionally, the judgment module 302 determines the target component temperature from the surface temperature and the middle temperature of the coil according to the surface temperature of the outdoor unit heat exchanger included in the environmental parameters and the middle temperature of the coil of the defrost coil included in the first temperature parameter, specifically including:

[0193] According to the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the middle temperature of the defrost coil included in the first temperature parameter, the surface temperature and the middle temperature of the coil are compared to obtain a temperature comparison result;

[0194] When the temperature comparison result indicates that the middle temperature of the coil is lower than the surface temperature within the second preset duration, the middle temperature of the coil is determined as the target component temperature;

[0195] When the temperature comparison result indicates that the surface temperature is lower than or equal to the temperature in the middle of the coil within the second preset duration, the surface temperature is determined as the target component temperature.

[0196] It can be seen that this optional implementation can also compare the surface temperature and the middle temperature of the coil based on the surface temperature of the outdoor unit heat exchanger included in the environmental parameters and the middle temperature of the coil of the defrost coil included in the first temperature parameter, and when the temperature comparison result is used to indicate that the middle temperature of the coil is lower than the surface temperature within the second preset duration, the middle temperature of the coil is determined as the target component temperature; and when the temperature comparison result is used to indicate that the surface temperature is lower than or equal to the middle temperature of the coil within the second preset duration, the surface temperature is determined as the target component temperature, which can improve the accuracy and reliability of determining the target component temperature based on the comparison result of the surface temperature and the middle temperature of the coil.

[0197] In this optional embodiment, the operating time parameter may include the cumulative operating time of the last defrost. And, the judgment module 302 judges whether the operating time parameter satisfies the preset operating time condition based on the acquired operating time parameter of the air-conditioning system, and the method of obtaining the operating time judgment result may specifically include:

[0198] According to the acquired accumulated operation time of the last defrost of the air-conditioning system, determining whether the accumulated operation time of the last defrost reaches a first preset operation time;

[0199] If it is determined that the cumulative running time of the last defrost has not reached the first preset running time, it is determined that the cumulative running time of the last defrost does not meet the running time condition corresponding to the cumulative running time of the last defrost;

[0200] If it is determined that the cumulative running time of the last defrost reaches the first preset running time, it is determined that the cumulative running time of the last defrost satisfies the running time condition corresponding to the cumulative running time of the last defrost; or,

[0201] If it is determined that the cumulative running time of the last defrost reaches the first preset running time, at least one last defrost running temperature corresponding to the cumulative running time of the last defrost is obtained; and the running time judgment result is determined according to the last defrost running temperature.

[0202] It can be seen that this optional implementation manner can also, when the running time parameter includes the cumulative running time of the last defrost, determine whether the cumulative running time of the last defrost has reached the first preset running time based on the cumulative running time of the last defrost of the air-conditioning system; if it is determined that the first preset running time has not been reached, it is directly determined that the cumulative running time of the last defrost does not meet the running time condition corresponding to the cumulative running time of the last defrost, thereby improving the efficiency and accuracy of determining that the cumulative running time of the last defrost does not meet the corresponding running time condition; if it is determined that the first preset running time has been reached, it is directly determined that the cumulative running time of the last defrost meets the running time condition of the last defrost. The operation time condition corresponding to the cumulative defrost operation time improves the efficiency and speed of determining whether the cumulative time of the last defrost operation meets the corresponding operation time condition; or, if it is judged that the first preset operation time is reached, at least one last defrost operation temperature corresponding to the cumulative operation time of the last defrost is obtained; and according to the last defrost operation temperature, the operation time judgment result is determined, which improves the accuracy and reliability of determining whether the cumulative time of the last defrost operation meets the corresponding operation time condition, and through a variety of judgment methods of the last defrost parameters, the diversity and flexibility of judging whether the cumulative time of the last defrost operation meets the corresponding operation time condition can be improved.

[0203] In this optional embodiment, as an optional implementation, the operation duration parameter also includes the current heating operation duration. And, the judgment module 302 judges whether the operation duration parameter meets the preset operation duration condition based on the acquired operation duration parameter of the air-conditioning system, and the method of obtaining the operation duration judgment result may specifically include:

[0204] According to the acquired current heating operation time of the air-conditioning system, determining whether the current heating operation time reaches a second preset operation time;

[0205] If it is determined that the current heating operation duration reaches the second preset operation duration, determining that the current heating operation duration satisfies the operation duration condition corresponding to the current heating operation duration;

[0206] If it is determined that the current heating operation duration has not reached the second preset operation duration, it is determined that the current heating operation duration does not meet the operation duration condition corresponding to the current heating operation duration.

[0207] It can be seen that this optional implementation can, when the operation duration parameter includes the current heating operation duration, determine whether the current heating operation duration has reached the second preset operation duration based on the current heating operation duration of the air-conditioning system; if it is determined that the second preset operation duration has been reached, it is determined that the current heating operation duration meets the operation duration condition corresponding to the current heating operation duration, thereby improving the accuracy and reliability of determining whether the current heating operation duration meets the corresponding operation duration condition; if it is determined that the current heating operation duration has not yet reached the second preset operation duration, it is determined that the current heating operation duration does not meet the operation duration condition corresponding to the current heating operation duration, thereby improving the accuracy and reliability of determining that the current heating operation duration does not meet the corresponding operation duration condition.

[0208] In another optional embodiment, the acquisition module 301 is also used to obtain a set of defrost operation parameters of the air-conditioning system during the defrost process, and the defrost operation parameter set includes one or more combinations of temperature parameters of the water tank, pressure parameters of the temperature control device, second temperature parameters of the defrost coil, and continuous operation time parameters of the defrost coil.

[0209] The judgment module 302 is further used to judge whether the current condition of the air-conditioning system meets the preset defrost end condition according to at least one parameter in the defrost operation parameter set.

[0210] The control module 304 is further configured to control the air conditioning system to end the defrosting operation when the determination module 302 determines that the current condition of the air conditioning system satisfies the defrosting end condition.

[0211] It can be seen that this optional embodiment can timely obtain at least one defrost operation parameter of the air-conditioning system during the defrost process, such as: water tank temperature, temperature control equipment pressure, defrost coil temperature and its continuous operation time, etc., and judge whether the air-conditioning system currently meets the defrost termination condition based on at least one defrost operation parameter. If so, the air-conditioning system is controlled to end the defrost operation, and the control flexibility, accuracy and reliability of the defrost termination operation can be improved based on a variety of defrost operation parameters.

[0212] Embodiment 4

[0213] See also Figure 4 , Figure 4 FIG. 1 is a schematic diagram of the structure of another defrost control device for an outdoor heat exchanger disclosed in an embodiment of the present invention. Figure 4 As shown, the defrost control device of the outdoor unit heat exchanger may include:

[0214] A memory 401 storing executable program codes;

[0215] a processor 402 coupled to the memory 401;

[0216] The processor 402 calls the executable program code stored in the memory 401 to execute the steps in the defrost control method for the outdoor unit heat exchanger described in the first embodiment of the present invention or the second embodiment of the present invention.

[0217] Embodiment 5

[0218] An embodiment of the present invention discloses a computer storage medium, which stores computer instructions. When the computer instructions are called, they are used to execute the steps in the defrost control method of the outdoor unit heat exchanger described in the first embodiment of the present invention or the second embodiment of the present invention.

[0219] Embodiment 6

[0220] An embodiment of the present invention discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to enable a computer to execute the steps in the defrost control method for an outdoor unit heat exchanger described in Embodiment 1 or Embodiment 2.

[0221] The device embodiments described above are only illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, i.e., they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative work.

[0222] Through the specific description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solution can be essentially or partly contributed to the prior art in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, and the storage medium includes a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable rewritable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0223] Finally, it should be noted that the defrost control method and device for an outdoor unit heat exchanger disclosed in the embodiment of the present invention discloses only the preferred embodiments of the present invention, which are only used to illustrate the technical solution of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A defrosting control method for an outdoor unit heat exchanger, characterized in that: The method comprises: Acquire an environmental parameter of an outdoor unit heat exchanger of an air conditioning system and a first temperature parameter of a defrost coil of the air conditioning system; Determining whether a current condition of the air-conditioning system meets a preset defrost entry condition according to the environmental parameter and the first temperature parameter; When it is determined that the current condition of the air-conditioning system meets the defrost entry condition, determining the operation control parameters of the defrost component of the air-conditioning system, the defrost component including one or more combinations of a four-way valve, an electronic expansion valve and a fan; According to the operation control parameters of the defrost component, the air conditioning system is controlled to perform a defrost operation on the outdoor unit heat exchanger.

2. The defrosting control method for an outdoor heat exchanger according to claim 1, characterized in that: The determining, based on the environmental parameter and the first temperature parameter, whether the current condition of the air-conditioning system meets a preset defrost entry condition includes: Determining whether the ambient temperature in the ambient parameters is lower than or equal to a first preset temperature, which is recorded as a first condition; According to the acquired operation time parameter of the air conditioning system, determining whether the operation time parameter meets a preset operation time condition, and obtaining an operation time determination result, which is recorded as a second condition; According to the ambient temperature, the surface temperature of the outdoor unit heat exchanger included in the ambient parameter, and the coil middle temperature of the defrost coil included in the first temperature parameter, determining whether each of the ambient temperature, the surface temperature, and the coil middle temperature satisfies a corresponding temperature condition, which is recorded as a third condition; Among them, when the first condition, the second condition and the third condition are all met, it is determined that the current condition of the air-conditioning system meets the preset defrost entry condition; when at least one of the first condition, the second condition and the third condition is not met, it is determined that the current condition of the air-conditioning system does not meet the preset defrost entry condition.

3. The defrosting control method for an outdoor heat exchanger according to claim 2, characterized in that: The step of judging whether each of the ambient temperature, the surface temperature and the coil middle temperature satisfies a corresponding temperature condition according to the ambient temperature, the surface temperature of the outdoor unit heat exchanger included in the ambient parameter and the coil middle temperature of the defrost coil included in the first temperature parameter comprises: According to the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the coil middle temperature of the defrost coil included in the first temperature parameter, determining the target component temperature from the surface temperature and the coil middle temperature; Determine whether the ambient temperature is within a first preset temperature range, and whether the target component temperature is lower than or equal to a second preset temperature within a first preset duration, which is recorded as a first temperature determination condition; or, Determine whether the ambient temperature is within a second preset temperature range, and whether the target component temperature is lower than or equal to a third preset temperature within the first preset duration, which is recorded as a second temperature determination condition; or Determine whether the ambient temperature is within a third preset temperature range, and whether the target component temperature is lower than or equal to a fourth preset temperature within the first preset duration, which is recorded as a third temperature determination condition; or, Determining whether the ambient temperature is within a fourth preset temperature range, and whether the temperature of the target component is lower than or equal to a fifth preset temperature within the first preset duration, which is recorded as a fourth temperature determination condition; Among them, when one of the first temperature judgment condition, the second temperature judgment condition, the third temperature judgment condition and the fourth temperature judgment condition is met, it is determined that each of the ambient temperature, the surface temperature and the middle temperature of the coil meets the corresponding temperature condition.

4. The defrosting control method for an outdoor heat exchanger according to claim 3, characterized in that: The step of determining the target component temperature from the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the middle temperature of the coil of the defrost coil included in the first temperature parameter comprises: According to the surface temperature of the outdoor unit heat exchanger included in the environmental parameter and the middle temperature of the coil of the defrost coil included in the first temperature parameter, the surface temperature and the middle temperature of the coil are compared to obtain a temperature comparison result; When the temperature comparison result indicates that the middle temperature of the coil is lower than the surface temperature within a second preset duration, determining the middle temperature of the coil as the target component temperature; When the temperature comparison result indicates that the surface temperature is lower than or equal to the middle temperature of the coil within the second preset duration, the surface temperature is determined as the target component temperature.

5. The defrosting control method of the outdoor unit heat exchanger according to claim 4, characterized in that: The operating time parameter includes the cumulative operating time of the last defrost; And, judging whether the operating time parameter satisfies a preset operating time condition according to the acquired operating time parameter of the air-conditioning system, and obtaining an operating time judgment result includes: According to the acquired accumulated operation time of the last defrost of the air-conditioning system, determining whether the accumulated operation time of the last defrost reaches a first preset operation time; If it is determined that the last defrost cumulative operation time has not reached the first preset operation time, determining that the last defrost cumulative operation time does not meet the operation time condition corresponding to the last defrost cumulative operation time; If it is determined that the cumulative running time of the last defrost reaches the first preset running time, it is determined that the cumulative running time of the last defrost satisfies the running time condition corresponding to the cumulative running time of the last defrost; or If it is determined that the cumulative running time of the last defrost reaches the first preset running time, at least one last defrost running temperature corresponding to the cumulative running time of the last defrost is obtained; and the running time judgment result is determined based on the last defrost running temperature.

6. The defrosting control method for an outdoor heat exchanger according to any one of claims 2 to 4, characterized in that: The operating time parameter also includes the current heating operating time; And, judging whether the operating time parameter satisfies a preset operating time condition according to the acquired operating time parameter of the air-conditioning system, and obtaining an operating time judgment result includes: According to the acquired current heating operation time of the air-conditioning system, determining whether the current heating operation time reaches a second preset operation time; If it is determined that the current heating operation duration reaches the second preset operation duration, determining that the current heating operation duration satisfies the operation duration condition corresponding to the current heating operation duration; If it is determined that the current heating operation duration has not reached the second preset operation duration, it is determined that the current heating operation duration does not meet the operation duration condition corresponding to the current heating operation duration.

7. The defrosting control method for an outdoor heat exchanger according to any one of claims 1 to 5, characterized in that: The method further comprises: Acquire a defrost operation parameter set of the air conditioning system during the defrost process, wherein the defrost operation parameter set includes one or more combinations of a temperature parameter of a water tank, a pressure parameter of a temperature control device, a second temperature parameter of the defrost coil, and a continuous operation time parameter of the defrost coil; According to at least one parameter in the defrost operation parameter set, determining whether a current condition of the air-conditioning system meets a preset defrost end condition; When it is determined that the current condition of the air-conditioning system satisfies the defrost end condition, the air-conditioning system is controlled to end the defrost operation.

8. A defrost control device for an outdoor unit heat exchanger, characterized in that: The device comprises: An acquisition module, used to acquire an environmental parameter of an outdoor unit heat exchanger of an air-conditioning system and a first temperature parameter of a defrost coil of the air-conditioning system; A judgment module, used for judging whether the current condition of the air-conditioning system meets the preset defrost entry condition according to the environmental parameter and the first temperature parameter; a determination module, configured to determine an operation control parameter of a defrost component of the air-conditioning system when the determination module determines that the current condition of the air-conditioning system satisfies the defrost entry condition, wherein the defrost component includes one or more combinations of a four-way valve, an electronic expansion valve, and a fan; The control module is used to control the air conditioning system to perform a defrosting operation on the outdoor unit heat exchanger according to the operation control parameters of the defrosting component.

9. A defrost control device for an outdoor heat exchanger, characterized in that: The device comprises: A memory storing executable program code; a processor coupled to the memory; The processor calls the executable program code stored in the memory to execute the defrost control method for the outdoor unit heat exchanger according to any one of claims 1 to 7.

10. A computer storage medium, characterized in that: The computer storage medium stores computer instructions, and when the computer instructions are called, they are used to execute the defrost control method for the outdoor unit heat exchanger according to any one of claims 1 to 7.

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